Fiber catalyst support

Polysilicate. [DuPont] Polysilicate binder for refractory, ceramic, metal, inorg. fiber, catalyst support, inorg. paint systems, zinc coatings findustrial applic. glass surface modifier. 

It is clear that CNTs have many advantages over other carbon materials in terms of electrical and thermal properties. These properties offer CNTs great potential for wide applications in field emission, conducting plastics, thermal conductors, energy storage, conductive adhesives, thermal interface materials, structural materials, fibers, catalyst supports, biological applications, and ceramics and so on [35]. 

Slotted plate for catalyst support designed with openings for vapor flow Ion exchanger fibers (reinforced ion exchange polymer) used as solid-acid catalyst None specified Hydrolysis of methyl acetate Evans and Stark, Eiir. Pat. Appl. EP 571,163 (1993) Hirata et al., Jap. Patent 05,212,290 (1993)... 

As a new kind of carbon materials, carbon nanofilaments (tubes and fibers) have been studied in different fields [1]. But, until now far less work has been devoted to the catalytic application of carbon nanofilaments [2] and most researches in this field are focused on using them as catalyst supports. When most of the problems related to the synthesis of large amount of these nanostructures are solved or almost solved, a large field of research is expected to open to these materials [3]. In this paper, CNF is tested as a catalyst for oxidative dehydrogenation of propane (ODP), which is an attractive method to improve propene productivity [4]. The role of surface oxygen annplexes in catalyzing ODP is also addressed. 

Glass Ceramics Sealing Glasses Catalyst Supports Fiber Optic Preforms Contolled Pore Glasses... 

As alternative materials to traditional particulate active carbons, much research has been carried out on the potential of active carbon fibers as gas and liquid phase adsorbents and catalysts/catalyst supports, as outlined below. 

Klctt, J.W. and Burchell T.D., Carbon fiber carbon composites for catalyst supports. In Proc 22nd Biennial Conf On carbon, Pub. American carbon Society, 1995, pp. 124 125... 

In this chapter, we reviewed the structure-controlled syntheses of CNFs in an attempt to offer better catalyst supports for fuel cell applications. Also, selected carbon nanofibers are used as supports for anode metal catalysts in DMFCs. The catalytic activity and the efficiency of transferring protons to ion-exchange membranes have been examined in half cells and single cells. The effects of the fiber diameter, graphene alignment and porosity on the activity of the CNF-supported catalysts have been examined in detail. 

The decomposition of methane is an important process since it can produce two valuable products hydrogen and carbon filaments. Wayne Goodman (Texas A M University) and Tushar Choudhary (ConocoPhillips) show that methane decomposition may be a viable alternative to conventional steam reforming as a source of hydrogen, without the formation of COx as a byproduct. The authors examine the effects of catalyst support and promoters, as well as the inevitable regeneration of the catalyst. The formation of carbon fibers, under certain conditions, makes this process an attractive one. 

A variety of photocatalyst supports has been examined experimentally. Dip-coated glass slides or plates have been used in many experimental systems as a simple lab-scale supported photocatalyst system. Coated glass offers many of tlte important features of a supported photocatalyst while still offering relatively simple preparation. Honeycomb monoliths, widely used as commercial catalyst supports for a variety of gas-phase applications, have also been examined as photocatalyst supports (Fig. 3). Although these monoliths offer good stability and excellent throughput, providing illumination for the photocatalyst inside the monolith channels can be problematic [41,42]. Randomly structured support materials, like fiber-based filters, reticulated foams, and similar materials, have been used... 

However, a serious issue for device integration with CNTs is posed by the inability to control whether the tubes or fibers are semiconducting, semimetallic, or metallic. This aspect will also play a role if carbon nanostructures are used as a catalyst support. Except for a selective destruction of metallic tubes (Collins et al., 2001) an interesting method to separate metallic from semiconducting CNTs is the use of AC DEP. This is done by bringing a suspension of the tubes in contact with a microelectrode array. Due to the different dielectric constant of the species with respect to the... 

Aluminas used in chromatography or as catalyst supports are prepared by heating hydrated oxide to various temperatures so that the surfaces may be partially or wholly dehydrated. The activity of the alumina depends critically on the treatment, subsequent exposure to moist air, and other factors. Concentrated aqueous A1C13 solutions can be spun into fibers which on drying produce filaments of A1203. They are non-toxic, unlike asbestos, possess excellent heat insulation properties, and are stable up to 1400°C. 

To investigate the effect of micropores, we conducted electrolyses using the following catalysts, unmodified ACF, iron and nickel catalysts supported on non-activated carhon fibers (CF/Fe, CF/Ni), iron catalyst supported on activated carhon fibers (ACF/Fe) and two types of nickel catalysts supported on activated carbon fibers (ACF/Ni-1, ACF/Ni-2). Table 1 shows the reduction product distributions for the various catalysts at -1.8V vs. SCE. The ACF catalyst itself has very fittle activity for CO2 reduction, and hydrogen evolution was the principal reaction. The CF/Fe and CF/Ni catalysts showed very little activity as well. 

Isotropic carbon fibers, whose degree of crystalline order is exceptionally low and whose structure is similar to glassy carbon, have the poorest mechanical properties. Their strength is, however, sufficient for their utilization as insulting fibers, filter media and for catalyst support. 

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